[GreenKeys] Additional paper source

[Jim Haynes]

And, as an aside, I wonder if anybody has a supply or still makes
he special kind of paper used in some of the Extel printers.  Some
of them had ribbon inking, and others used a paper made by 3M that
was described as being like litle eggs containing ink on the surfact.
Impact breaks the eggs and makes the ink visible.  This may be the
same kind of paper used in point-of-sale equipment to produce the
customer receipt.

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